Revert "Revert "guard old apis for querying byte-size of a bitmap/imageinfo/pixmap""

This reverts commit 809cbedd4b252be221b2ac3b4269d312fd8f53a0.

Bug: skia:
Change-Id: I680d8daeeeeb15526b44c1305d8fb0c6bfa38e1d
Reviewed-on: https://skia-review.googlesource.com/52665
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/src/codec/SkWebpCodec.cpp b/src/codec/SkWebpCodec.cpp
index 10b8283..baf3468 100644
--- a/src/codec/SkWebpCodec.cpp
+++ b/src/codec/SkWebpCodec.cpp
@@ -542,7 +542,7 @@
 
     config.output.u.RGBA.rgba = reinterpret_cast<uint8_t*>(webpDst.getAddr(dstX, dstY));
     config.output.u.RGBA.stride = static_cast<int>(webpDst.rowBytes());
-    config.output.u.RGBA.size = webpDst.getSafeSize();
+    config.output.u.RGBA.size = webpDst.computeByteSize();
 
     SkAutoTCallVProc<WebPIDecoder, WebPIDelete> idec(WebPIDecode(nullptr, 0, &config));
     if (!idec) {